FIELD TELEPHONE SET 'L' Mk1, 1950's

Introduced in 1941 and developed for a Linesman hence the designation 'L' or maintenance crew. The internal battery is isolated from the line by an internal transformer so that 'CB' or Central Battery may be used. A pull switch in front of the battery compartment is used to facilitate this. The whole unit is housed in a robust steel box, with a Magneto handle on the side which is used to ring the distant bell on the receivers set. The internal batteries, only power the microphone on this unit not the line. The type 'J' is similar see Item A0850, which does not have the 'CB' switch, a 'KEY' switch is fitted instead and a provision for an extra earpiece. These sets were made in Britain by many manufacturers officially approved by the General Post Office (GPO), and are not always marked by the maker.

A1681